Design of medical ward call system based on power line carrier technology

This paper introduces a kind of work principle and structure of medical ward call system based on power line carrier technology, also introduces a direct sequence spread spectrum half-duplex asynchronous modem PL2102 carrier chip, calls of hospital ward to nursing station can be achieved by using the power line carrier circuit consisted of it. This call system uses master-slave structure, the host is placed in the ward nurse duty room, extensions are installed in all wards, power line carrier technology is used between the host and the extensions, and the power line is as a transmission channel, to achieve two-way data transmission between the host and extensions. Actual use shows that when the communication distance between the host and extensions bed calls is less than 1000m, it communicates stably and reliably, almost there is no false alarm.